Impact part 0555595 is an Inlet Valve Ball used in the pump section of Impact 1640 pressure washers. This precision-ground stainless steel ball seats against the inlet valve to allow water flow into the pump while preventing backflow during the compression stroke. Replacing a worn or corroded valve ball restores proper pump priming, pressure consistency, and overall performance.
| Part Number | 0555595 |
|---|---|
| Part Description | Inlet Valve Ball |
| Brand | Impact |
| Fits | Impact 1640 Pressure Washer |
| Condition | New |
The Impact 0555595 Inlet Valve Ball is a critical component of the pump's valve system on Impact 1640 pressure washers. Made from corrosion-resistant stainless steel, this precision ball works in conjunction with the valve seat to create a one-way check valve that controls water flow into the pump.
During the intake stroke, the ball lifts to allow water to enter the pump cylinder. On the compression stroke, it seats firmly to prevent backflow. A worn, pitted, or out-of-round valve ball will fail to seal properly, leading to poor priming, pressure fluctuations, and reduced cleaning performance.
| One-way flow control | Allows water to enter the pump while preventing backflow during compression |
|---|---|
| Pressure maintenance | Helps maintain consistent outlet pressure by ensuring proper pump fill |
| Priming assistance | Critical for pump self-priming and preventing air ingestion |
| Poor priming | Pump struggles to draw water or loses prime during operation |
|---|---|
| Pressure surging | Fluctuating outlet pressure due to inconsistent water intake |
| Visible wear | Pitting, corrosion, or out-of-round condition on the ball surface |
| Backflow issues | Water pushes back through the inlet during operation |
Impact part 0555595 is compatible with the following Impact pressure washer model. Always confirm fitment using the correct parts diagram for your exact model and revision.
| Impact Model | Component |
|---|---|
| Impact 1640 Pressure Washer | Inlet Valve Ball (0555595) |
When servicing the inlet valve, these components are often inspected or replaced at the same time to ensure complete pump performance.
A worn or pitted seat will prevent the new ball from sealing properly.
Both inlet and outlet valves wear together; replacing both ensures balanced performance.
Weak or broken springs affect ball movement and sealing pressure.
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